How long does an astronaut need to practice in the water to prepare for a two-hour spacewalk?
A: ten hours
B: twenty hours
C: thirty hours
D: hundreds of hours
A: ten hours
B: twenty hours
C: thirty hours
D: hundreds of hours
举一反三
- A: How ______ is it from here to Beijing?B: It's about _______ flight. A: long; two hours' B: far; a two-hour C: long; a two-ours D: far; two hours'
- A ()talk is too long for those children. A: two hours B: two hour’s C: two-hour D: two-hours
- how long will they stay in the museum of Terracotta Army? A: 1 hour B: 2 hours C: 3 hours D: 2.5 hours
- How long will the volunteer spend on math each week if teaching both math and English A: One hour a week. B: Two hours a week. C: One hour a day. D: Two hours a day.
- How many hours can international students work during school breaks? A: Twenty hours B: More than twenty hours. C: Thirty hours. D: Not mentioned